Tim,
Yes, I already installed the UMDF driver on windows, I do not know exactly
what libusb is trying to do here, I looked some of libusb's source code,
looks like it is using some of winusb api. from the legacy code (that
works), I noticed that it passes IOCTL_EZUSB_GET_SERIAL_NUMBER to windows
api DeviceIoControl , but I do not see anywhere I could pass this
parameter to libusb_get_string_descriptor_ascii, does that mean
libusb_get_string_descriptor_ascii will not working for me on this device?
if yes, how do I map the call from DeviceIoControl to
libusb_control_transfer
Thanks.
John
On Mon, Jul 16, 2012 at 11:46 AM, Tim Roberts <t...@probo.com> wrote:
> John Chen wrote:
> > Peter,
> > Yes, you are right, this is a custom device, Here is the legacy code
> > to get the serial number
> >
> > if ( ::DeviceIoControl(m_hDeviceObject, IOCTL_EZUSB_GET_SERIAL_NUMBER,
> > NULL, 0, serial, cb, &cbOut, NULL))
> > ...
> > do you know what I should do to map
> > the DeviceIoControl to libusb_control_transfer in this case?
>
> That's a command to the Cypress generic driver for the FX2 chip. That
> generic driver converts this to a GET_DESCRIPTOR control message,
> exactly like the one in your code.
>
> I noticed the following lines in your log:
>
> > [ 0.159532] [000009c0] libusbx: debug [get_api_type] driver(s): WUDFRD
> > [ 0.160032] [000009c0] libusbx: debug [get_api_type] lower filter
> > driver(s): WINUSB
>
> So, it looks like this device has a UMDF driver, with WINUSB as a lower
> filter. Is libusbx trying to talk to this WINUSB instance? That is,
> does it assume that, if there is a WINUSB driver, it must be one it can
> chat with?
>
> --
> Tim Roberts, t...@probo.com
> Providenza & Boekelheide, Inc.
>
>
>
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